I ran our first game of Dungeon World this week, and one of the players selected the Druid class.

We had some trouble adjudicating the Shapeshifter move during play.

During the session the Druid used the forms owl, bear, and raccoon.  How do the "moves associated with your new form" typically work?  Does the player just need to spend the hold, or is a roll in order?

For example, if a bear has the moves:
• tear someone apart
• intimidating roar

Does the player just spend hold, messily tear a bandit into bloody chunks, and cause the remainder to flee? This seems pretty powerful, and could quickly overshadow the other characters. Any sort of "auto-success" moves seem like they could dominate the story.

Some of the players also started a thread about this on BGG:
http://boardgamegeek.com/thread/890467/sample-druid-shapeshift-moves